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A203710 Number of (n+1)X2 0..5 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) such that rows of b(i,j) and columns of c(i,j) are lexicographically nondecreasing 1
406, 5411, 64568, 680400, 6489940, 57269565, 475164554, 3751457500, 28439396482, 208468893647, 1485783530684, 10341422407224, 70546056791520, 473056332125577, 3125814445750542, 20394520446794452, 131617722687439662 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A203714

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 40*a(n-1) -725*a(n-2) +7890*a(n-3) -57598*a(n-4) +298496*a(n-5) -1133650*a(n-6) +3211340*a(n-7) -6839701*a(n-8) +10954608*a(n-9) -13092665*a(n-10) +11477170*a(n-11) -7151500*a(n-12) +2994456*a(n-13) -754560*a(n-14) +86400*a(n-15)

EXAMPLE

Some solutions for n=4

..2..1....1..2....4..3....2..0....5..4....0..5....2..4....5..3....5..1....5..3

..4..5....1..5....2..5....3..5....4..5....0..5....2..4....3..5....1..5....3..5

..4..5....1..5....4..3....3..5....4..5....3..3....5..5....4..4....1..5....3..5

..4..5....4..2....2..5....3..5....4..5....1..5....5..5....3..5....1..5....3..5

..4..5....3..3....5..3....3..5....4..5....3..3....5..5....5..3....4..2....3..5

CROSSREFS

Sequence in context: A203944 A203937 A203714 * A251096 A233052 A210329

Adjacent sequences:  A203707 A203708 A203709 * A203711 A203712 A203713

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2012

STATUS

approved

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Last modified May 17 02:55 EDT 2022. Contains 353727 sequences. (Running on oeis4.)